Systems and methods for providing polarization-compensated multispectral laser repair of liquid crystal display panels

Abstract

A system for repairing a liquid crystal display panel including a polarizing film is disclosed. The system includes a laser repair optics system, a measurement optics system and a processor. The laser repair optical system includes a polarization unit for modifying the polarization of a laser repair beam along a laser output path directed towards the workpiece. The measurement optics system includes an illumination source for providing measurement illumination along a measurement illumination path and a detector for detecting reflected measurement illumination. The processor adjusts the polarization unit in response to the reflected measurement illumination.

Description

[0001] priority [0002] This application claims priority to US Utility Application Serial No. 13 / 793,190, filed March 11, 2013, which is hereby incorporated by reference in its entirety and subject matter. Background technique [0003] The present invention generally relates to laser repair of electronic devices including arrays of discrete circuits, any of which may be isolated in the event of a defect in the discrete circuits. And in particular, the present invention relates to repairing of liquid crystal display panels. [0004] Liquid crystal display (LCD) panels may generally include a layer of liquid crystal sandwiched between glass plate structures, one of which includes an array of transistor elements (with signal and gate lines) in a substantially transparent electrode layer. Another glass sheet structure typically includes a multitude of color filter sets (eg, red green and blue) that form color display pixels. [0005] It is known that individual transistor eleme...

AI Technical Summary

Problems solved by technology

In devices that employ a polarizing film or sheet located on the outer surface of the device, the pixel repair process is more complicated because different polarization orientations will result in different amounts of polarized laser energy being applied to the defective pixel

[0011] While many procedures have been developed for dimming defective pixels in liquid crystal displays, there is still a need for such systems and methods that overcome disadvantages of conventional methods such as, for example, difficulty in managing trapped air bubbles when liquid crystal molecules are disturbed, and Difficult to perform processing steps when polarizing films are used in LCDs

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